Automatic telephone system



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AUTOMATIC TELEPHONE SYSTEM Inveniur- QL L May 20, 1930. H; M. FRIENDLY1359,190

AUTOMATIC TELEPHONE SYSTEM Filed March 5, 1928 7 Sheets-Sheet 2 a \f' 1:I

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1 AUTOMATIC EELEPHONE SYSTEM Filed March 5, 1928 7 Sheets-Sheet 3Inverfiur Herb eri-I'q-Friandlg i. May 20, 1930 H. M. FRIENDLY 1,759,190

AUTOMATI C TELEPHONE S YSTEM Filed March 5, i928 7 Sheets-Sheet 4 Fig.8.

Fig-4- Inveniur- Her]: eri-II-Friendlg 1930- H. M. FRIENDLY 1,759,i90 IAUTOMATI C TELEPHONE SYSTEM mwwu May 20, 1930. H. M. FRIENDLY AUTOMATICTELEPHONE SYSTEM 7 Sheets-Sheet Filed March 5, 1928 WNW Invenmr- R QRMay 20, 1930. H. M. FRIENDLY AUTOMATIC TELEPHONE SYSTEM msww Filed March5, 1928 7 Sheets-Sheet W NK, v

Invenifiv Herberi-P'PFriendlQ Patented May 2%, 193d HERBERT Tv'i.FRIENDLY,

areas near OF CHICAGO, ILLENOIS AUTOMATIC TELEPHONE SYSTEM Applicationfiled March 5,

The general objects of the present invention are to enable a subscriberof the automatic telephone sysem, who contemplates temporarily leavingthe location of his telephone, to directively set central cficeapparatus or call-forwarding equipment associated with his line throughthe agency of his automatic calling device dial on his telephone so thatin case any calls are thereafter directed to his line, the latter saidcalls will be further extended or forwarded to a prede ermined randomsubscribers line or other line of the system. That is, for example, asubscriber before leaving the premises may remove the receiver of histelephone as if to initiate a call, and then operate his calling devicedial by placing his fore-linger in a specific depression finger-hold ofthe dial and then draw the dial until his finger encounters thefinger-stop, so that when the dial is released it will send a series ofeleven open impulses. After the dial has restored, he will restore thereceiver, leaving the central. othce call-forwarding equipment in theset condition. The same kind of manual operation will unset the setcondition.

However, in accordance with the present invention, in the event that thebefore-mentioned (normally) predetermined line is not the line to whichit is in the particular instance desired to have the calls forwarded,the said predetermined line may be directively changed. The latter isaccomplished by annexing the telephone number of the line to which it isdesired to have calls forwarded in the particular instance, forthwithafter operating the dial to effect the series of eleven open impulsesmentioned. The receiver will then be restored to the switch-hook,leaving the set line in condition for forwarding calls directed to it tothe specific line indexed by the number annexed after primarily settingthe line by the series of eleven open impulses. That is 1928. Serial N0.259,049.

to say, not only is there a normally predetermined line to which callsmay be forwarded when a set condition exists on a line called, but thisnormally predetermined line may be temporarily changed to a randomdesired line of the exchange.

In connection with the last foregoing, relating to changing from thenormally pre determined line to a random desired line to which callswill be forwarded under the set condition, when the subscribers line isto be unset it is done by initiating a call thereon and then sending aseries of eleven open impulses. The later effaces not only the said setcondition accomplished responsive to the tirst said sending of theeleven open impulses, but it also effaces the substituted random desiredline setting and renders the normally predetermined line subject tobeing called when the subscriber next causes his line to be set bysending the series of eleven open impulses and without annexing anydigits.

It will thus be perceived that the present invention is adapted for usein connection with a subscribers telephone line wherein it may bedesired to have calls which may be made thereto, in the absence of thesubscriber,

forwarded to a desired random line of the exchange as may bepredetermined by the subscriber when he sets his line for forwardingcalls made thereto. That is, a residence subscriber may leave hisresidence and go to the residence of some other random subscriber, anddesires that all calls made to his telephone be forwarded to thetelephone of the subscriber where he will be found. Moreover, a businessestablishment may Wish to have some employee respond to after businesshours calls. The line will, therefore, be set to forward calls made toit to any desired telephone of an employee, perhaps a different employeebeing selected for successive days. That is, there may be apredetermined employee who will be charged with responding to such callsresponsive to the normal setting of the set relay, while this may atwill be changed to a random tele phone line by simply annexing thenumber of the latter telephone line, after normally setting the line forforwarding.

S ll

The set condition may be at will eflaced. It will be effaced at apredetermined time automatically. Of course, a manual setting may bemade in the central office, in the event the subscriber neglected to setthe line and a duly authenticated request from him is made for suchmanual setting. i

General operation Reference ismade to my pending applications for PatentSer. No. 218,605, filed Sept. 10,1927; Ser. No. 257,480, filed Feb. 27,1928; also U. S. Patent 1,744,696, granted Jan. 21, 1930. These pendingapplications and patent are directed to a telephone system and apparatushaving objects broadly as set forth in the foregoing statements. Thepresent inventionhas features believedto be novel not disclosedin thesaid cited pending ap-' plications. Some of these latter said novelfeatureswill be specifically described and pointed 'out in the presentspecificat ons,

while other said novel features will be apparent in view ofthedisclosures specifically set forth'in the specifications and drawings.

Among the features ofthe present invention believed to be novel are;

a. Time controlled means for setting the subscribers line at apredetermined time so can besubscriber directively set or unset inadvance of thepredetermined time for automatically setting and unsettingit by the time controlled mechanism. The automatic time controlledmechanism thus insures that no oversight will occur in setting the lineor unsetting'the line; at least by a time of 7 day limit.

a. Specific tone sources are provided to indifcate to the subscriberwhen he has operated his calling device to set and to unset the linethat this operation has actually become eifective, and thus confirms theoperation which takes place. This is having in mind that the subscribermay set his line for forwarding calls directed to it-and then because offorgetting about it performs the same directive operation subsequently,which latter operation will change back the condition. Remembering thatthe same manual operation'is made by the'subscriber for setting andunsetting, it will'be clear that ifsome tone or some other indicatingmeans is not employed to confirm the operation, the subscriber would notbe certain of the condition existing. The tone will thus prompt thesubscriber if the unintended operation occurred.

d. Specific tone sources are provided for indicating to the subscriberwhen he removes his receiver, as when initiating a call, whether 7 hisl1ne 1s 1n the set or unset condition. The

calling device on the subscribers telephone in accordance with the saiddesired random line. That is, thesubscriber willinitially set his lineby the series of eleven open im pulses to cause calls directed to hisline to be forwarded to the said predetermined line. However, he may, bythereupon sending dig its corresponding to some desired random telephoneline, cause the latter said line to be the line to which calls will beforwarded, in lieu of said predetermined line. The subscriber may nowhang up his receiver, leaving his line set. He will unset his linebyremoving his receiver and operating his calling device to send elevenopen impulses.

7. When the subscriber has set his line for forwarding calls directed toit to some desired random line, he will perceive a specific toneresponsive to sending the last digit of the latter said line inelfectuating the setting.

g. When the subscriber hangs up his 'receiver after causing his line tobe set for forwarding calls directed to it to a desired random line, hemay remove his receiver and initiate and make an outgoing call as if hisline were not in the set condition. In fact, he may make an outgoingcall while his tele phone number is in a called condition wherein thecall is being forwarded towards or is forwarded to the predeterminedline to receive such forwarded calls.

line switch B to the corresponding 'bank' terminals accessible from linefinder switch F in Fig. 3; The indicated connector 'D normally hasaccess to the line leading to telephone A.

Fig. 2 shows a first selector E of a group accessible from line switchB. It also indicates a calling telephone A leading to a line switch Lthe latter having access to first selector B second selector C thirdselector J and connector D in Fig. 1, in sequence to complete a callfrom telephone A. in Fig. 2 to the telephone A. in Fig. 1.

Fig. 3 shows a line finder switch F involving a Xiliary apparatus, thesaid switch F having access to terminals of a plurality of lines whichmay be called through connector I) in Fig. l, or random connectors inthe exchange oifice containing connector D wherein contact springs of aset relay similar to C are interposed. Each said line accessible fromthe switch F has a line relay as shown on the left aligned with therelays of the said switch. l l hen the switch F operates and seizes aset of its bani: terminals corresponding to a line called, its lowergroup of four wipers are then co-operative with bank terminals whichcorrespond to the impulse sending mechanism which is individual to thesaid line called, so that while the finder switch F is common to aplurality of lines, the sending mechanisms are each individual to a saidline.

Fig. 4 shows a first selector G companion to and individual to theswitch in 3. The first selector G has access to othe switches in commonwith first selector F in Fig. 2.

Fig. 5 shows the impulse sending mecha nism for directing tl efoi"-.varding of calls. The said impulse sending mechanism is individualto the line leading to telephone A, and it is seized by the switch Fwhen the latter said switch seizes the bank terminals which arecompanion to the connector bank terminals of the line leading totelephone 1%..

Fig. 6 shows switches H, I and J, being the digit setting switches forthe first three digits of the number (of five digits) of the line towhich calls directed to the line leading to telephone A are to beforwarded to.

Fig. 7 shows switches K and L, being the digit setting switches for thelast two digits of the number of the line to which calls directed to theline leading to telephone A are to be forwarded to. 'i also shows theswitch M which. distributes to the switches H to L.

Fig. 8 shows a preferred modification of Fig. 1 and is introduced whereindicated by the reference characters, for the objects set forth in theforegoing paragraph d.

Fig. 9 is a diagram showin the assembly of the seven sheets ofaccompanying drawings to disclose the circuits employed to ex emplifythe present invention. The lines extending towards the margins whichregister are continuations of the same line.

9 0 y and the switch elements h, L and Vi 1n F1g.

Equipment The telephone A in Fig. 1 is the well known common batteryseries type, but is equipped with an automatic calling device and dialas disclosed in my said pending application Ser. l lo. 218,605, filedSept. 10, 1927, and illustrated in Figs. '1 and 8 thereof. The dialenables a series of eleven open impulses to be sent responsive tooperating and releasing a specific finger-hold depression positionedafter the 0 digit finger-hold.

The line switch B is of the well known rotary class as described on page53 of Her sheys Automatic Telephone Practice, third 'on. However, theline switch B has an ed upper wiper for objects of the presentinvention.

The connector D in Fig. 1 is of the well known type as shown in Fig. 73of the fourth edition of the said book.

T he first selector in Fig. 2 is of the well known type sometimes calleda Powell selector, and described on pages 59 to 61 of the said thirdedition of llersheys book. However, a set of eleventh vertical positionoilnormal springs and connected circuits have been introduced for thepurposes of the present invention. It also has eleven levels of bankterminals.

The first selector G in Fig. l is of the well known said Powell type.

The selectors B C in, F and J in Fig. 2 and D in Fig. l are likeselector G in Fig. 4-.

The line switch L in Fig. 2 is like switch B in Fig. 1.

lhe connectors H and G in Fig. 2 are like connector l) in 1.

The line finder switch F in Fig. 3 is of the class shown and describedon pages to 57 of the said third edition of Hersheys book. However,modified for the purposes of the present invention.

The switch elements P and the switch elements l and S in Fig. 5, l and Jin Fig. 6,

belong to the class of switch B in Fig. l, modified in accordance withthe present invention.

it will be understood that any other suitable switches may besubstituted for the said well known switches ientioned, withoutdeparting from the spirit of the present invention. Also, that theswitches specific to the present invention may be modified by thoseskilled in the art without departing from the spirit of the presentinvention, as defined by the subjoined claims.

It will, of course, be understood that in a commercialembodiment of thepresent invention a plurality of switches in a group will be employed inplace of the exemplary single switches used in disclosing the presentinvention, so that a plurality of calls may be coexistent, the switchesin the groups having predetermined order of use with respect toantecedent co-operative switches. 1 Detailed joerat2'onln2'tiatng a callfrom telephone A to telephone A Upon removing the receiver from theswitch-hook of telephone A, the line switch B will operate in the wellknown manner to seize the first idle selector E. The calling party willthen operate his calling device in accordance with the live digits13-4-31 of the telephone number of the line leading to telephone A andthus correspondingly set the selectors E, D and F and connector H 9 Theconnection may then be released in the well known manner, responsive tothe calling party replacing his receiver on the switcl hook. A call totelephone A the telephone number of which is 14321, will be effected in0 a generally like manner. It will be noted that the telephones A and Aare both located tributary to the 1 otlice of the exchange; reachedthrough the 1 level of first selector E. Of course, other telephones ofthe system 5*. (not indicated) may be reached through other levels ofthe selector E and, therefore, belong to corresponding ofiices oitheexchange.

Thus, outgoing calls from telephone A under normal conditions are madein the well known manner and employ well known switches, with due regardto the special modifications in switches B and E before mentioned, whichmodifications are not brought into play under normal calling conditions.

Setting the line leading to telephone A so that calls directed to saidline will be forwarrlecl to telephone A Let it be assumed that the partyat telephone A desires to set his line so that calls directed theretowill be forwarded to telephone A. The party at telephone A will removehis receiver as if to initiate an ordinary call. This will cause theline switch B -.to operate and select a first selector as E. The partyat telephone A will then operate his calling device dial in accordancewith the special finger-hold depression to effect a series of elevenopen impulses which will step the shaft 0f selector E vertically inaccordance therewith and operate the eleventh vertical olinormal springs201. The latter operation will cause ground to be applied over conductor202, bank terminal12 of set 12 to 15, wiper 16 ofset 16 to 19, armature20, conductor 21, spring 22 of set relay C, armature 23 to the winding01": relay 24, the latter said relay actuating. The relay "24 will, byits armature 25 lock itself to the'conductor 21, and thus -remainactuatedas long as the ground is maintained on conductor 21.

At the time theofi-normal springs 201 operated, the selector E operatedin the well known manner to rotate-in and seize by its wipers 205 to 207the first set of idle bank terminals 208 to 210 of the'eleventh level.The

relay will actuate responsive to the seizing by seector Ewhen its relay213 actuates, and ground from armature 214 will be applied through bankterminal 208, wiper 205, armature 215., release trunk conductor 216,bank terminal 13, wiper 17, armature 26, conductor 27 This ground to therelease trunk will, therefore, maintain the relays 213 and 28 actuatedas long as the windings of relay 212 are maintained energized throughthe telephone A by the party thereat maintaining his receiver off theswitch-hook. The ground from the springs 201 is similarly maintained onconductor 21 until the shaft of selector E is restored under control ofthe party at tele phone A.

At the time relay 24 actuates, its armature 30 diseonnects'the windingof relay31. Armature 33 at the same time appliesground from conductor 21to the winding of magnet 34 of the set relay C. The latter said magnetwill cause the springs of relay C to be operated, and the dog 35 latchedover the catch 36 to retain the springs of relay G operated after thewinding of magnet 34 has been deenergized.

When the springs of relay C become operated, in a local circuit of relay24, tone trom source T is being applied through armature 38, audible tothe party at telephone A, indicative to him that the relay G is in itslatched or set condition, assuming that its circuit energized from therelay 24'is operative. The tone from armature 38 may be ap-' pliedthrough a normally disengaged spring of relay C so as to positivelyprevent the tone from being applied audible t0 the party at telephone Aunless the relay C actually operated. This spring is shown introduced inthe preferred modification Fig. 8.

The party at telephone A, upon hearing 1 the tone from source T willknow that his line relay 212 to deenergize and remove the holding groundfrom the release trunk 216, which will cause the shaft of the selector Eto restore in the obvious manner, in view ofthe cita= tions as towhat iswell known.

Unsetttng the line leading to telephone A so that calls thereafterdirected to said line will not be forwarded therefrom, the said linethen beng in normal condition Let it be assumed that'the party attelephone A deslres to unset his line, by unlocking the relay G and thuscause the springs thereof to restore to normal condition. The party attelephone A will remove his receiver as if to initiate an ordinary call,having in mind that even if the springs of relay C are operated andlocked by the dog 35, outgoing calls from telephone A through the lineswitch 13 will be effected normally as if the springs of relay C werenot in their operated. (011C ition.

The party at telephone A will then operate his calling device dial inaccordance with the special finger-hold depression to eifect a se ricsof eleven open impulses which will step the shaft of selector Evertically in accordance therewith and operate the eleventh verticaloff-normal springs 201 and select the relay, as 212, as when the partyat telephone A directed the setting of his line by the relay C. That is,ground will be applied from the springs 201 to the conductor 21.However, since the catch 36 is held in its actuated position by the dog35, the relay 24 is now di abled from operating because the spring 22 isflexed out of contact with its resting spring and is into engagementwith its make spring. Thus, the ground received over conductor 21 is nowapplied through spring 22, armature to the winding of relay 31, thelatter said relay actuating. A locking circuit for the relay 31 isthrough its armature to the conductor'21, which as before referred to,remains grounded until the party at telephone A hangs up his receiver.At the time relay 31 actuates, its armature 23 disconnects the windingof relay 24. The winding of relay 24 is thus maintained disconnected aslong as relay 31 is maintained energised.

At the time relay 31 actuates and disconnects the winding of relay 24,its armature 41 applies ground from conductor 21 to the winding ofunlatching magnet 43 of the set relay G. This will operate the lattersaid magnet to unlatch the dog 35 from the catch 36 and cause thesprings of relay C to restore to normal condition.

Having in mind that the relay 31 is actuated and held so until theground is removed from conductor 21, it will be obvious that tone fromthe source T will be applied through armature 44 audible to the party attelephone A, indicative that the relay C has been unset. The tone fromarmature 44 may be applied through a normally closed contact set ofrelay C so as to positively prevent the tone from being applied audibleto the party at telephone A unless the relay G actually deactuated tounset the line, While the relay 31 is actuated. This spring is shownintroduced in the preferred modification Fi 8.

The party at telephone A, upon hearing the tone from source T willltnowthat his line has been unset, and will, i r f g up his receiver,The latt rill cause the ielag U is locked and unlocked according toprearranged time schedule The time controlled circuit grounding devicesP and Q revolve continuously 1n the indicated direction at uniformspeed, mak- I ing a revolution in twentyfour hours. The conductivesegment 46 applies ground received from brush 47 through brush 48,armature 49 to the winding of slow-releasing relay 50, the latter saidrelay actuating at 5 p. m. i

This is assuming that the drawn position of the device Q is as at 12 m.The conductive segment 52 applies ground received from brush 53 throughbrush 54, armature 55 to the winding of slow-releasing relay 56, thelatter said relay actuating at 9 a. m. This is assuming that the drawnposition of the device P is as at 12 m.

In view of the indicated direction of revolution of the devices P and Q,the device Q, will be the first one to apply ground through its brush48. This will occur at 5 p. m., as stated. Responsive to relay 50actuating, relay will actuate and lock to ground on armature 49 untilthe ground applied through brush 48 is removed because of the segment 46moving from under the brush 48. When relay 60 actuates it deenergizesthe relay 50, and the latter said relay will then deactuate consistentwith its sloW-releasing characteristic. Only during the short time thatrelay 50 is actuated, ground from armature 61 will be applied througharmature 23 to the winding of relay 24. The relay 24 will. actuate inthe manner before described to in turn cause the energization of themagnet 34 from the ground applied from armature 61 through armatures 25and 33, to operate and lock the springs of set relay C.

At 9 a. in. followin the operation of relay 50, ground will be appliedfrom brush 54 of device P effective to operate the relay 56.

Responsive to relay 56 actuating, relay 63 will actuate and lock toground on armature 55 until the ground applied through brush 54 isremoved because of the segment 52 moving from under the brush 54. Whenrelay 63 actuates, it deenergizes the relay 56 and the latter said relaywill then deactuate consistent with its slow-releasing characteristic.Only during the short time that relay 56 is actuated ound fromarmature64 will be appli d t ..ough armature 30 to the winding 0 f 31sThe relay 31 will actuate in the I manner. before described to in turncause the energization of the magnet 43 from the ground applied 1 fromarmature 64 through armatures 40 and 41, to disengage the dog 35 so thatthe springs of relay C will restore to normal condition, and, therefore,the relay C will be in its unset'condition.

It will be particularly noted that if, for example, the relay C was inits set condition at the time relay 50 actuated,the relay will be causedto actuate as before described to energize the winding of the magnet 34,

p but to no effective purpose with respect to it, respectively, Thus, ifthe party at tele- ',phone A has set the relay C at 4 :45 p. m.

:and at 5 p. ,m. the relay 50 operates, no confusion can occur. In thesame manner, it the party at telephone A has unset the relay ,6 at 8:30.a. m. and at 9- a. m. the relay 53 operates, no confusion can occur.However,

.in the event the subscriber through inadver- :tencefails to operate hisset relay C before [leaving-for thenight, the relay C will beautomaticallyset at 5 p. m.

In this connection it will be understood that there will be as many setscorresponding to P andQ and their individual pair of relays 5.6and.63,'and and 60, respectively, as there are times of day when setrelays, as C,are to be operated, the various set relays being asso.ciatedwith the proper said device as P and Q depending upon the time ofday it is to. be automatically set-and unset.

'Uall to theline leading to telephone A antler 'hmmal condition whereinthe relay '0 is not set r Assume that the party at telephone desirestocall the telephone A, under nor- .mal conditions. The dial at telephoneA zwillbe operated in accordance with digits :2'.22111 after initiatingthe call. This will successively operate the selectorsB C and J andconnector D so thatwipers 65, 66 and 67 will seize bank terminals 71,7-2 and r '7 3, respectively. Ground from the connector willbe-appliedover private wiper 65, bank terminal 71, spring 74 to the winding ofrelay 28, the latter said relay operating to dis- .connect the linerelay'78 and the ground on the resting contact of armature 79, in thewell known manner. The connector D will now apply signaling current.ellective to the bell at telephone A, in the well known manating.

ner, the ellective circuits being those well known from Hcrsheysbookcitcd.

Gall t0 the. has leading to telephone A under the condition that the setrelay 0 is in 0peralecl condition ated and latched condition. Under thelatter said condition the relay 28 will not be ener glzed since thenormal conductors are d1s- "connected from the line leading to telephoneA. However, the latter said condition does not prevent the party attelephone A normally extending calls from said telephone.

It will be noted that the conductors leading from bank terminals 71 to73, disconnected connected to conductors 75 to 77, respectively. Thus,when the connector D seizes the line terminals 71 to 7 3, ground isapplied from the connector over wiper '65, bank'terminal 71, spring 74,conductor 75, armature 301, lower winding of relay 302, winding ofcommon relay 303 to grounded battery, the relay 303 actuating andcausing the dependent common relay 305 to actuate. Armature 306 on relay302 will attract from its resting contact to its make contact, whilearmature 301 remains inert for the time being. This condition causes allthe bank terminals accessible from the wiper 311 of the group of wipers311 to 313 to be grounded by the armature 314 c relay 305, excepting thebank terminal 315 correspondingto the relay 302, dueto the tractedcondition of armature 306. Ground is applied from the armature 314,conductor 317, armature 318 to the winding of slowreleasing relay 319,the latter said relay actu- The armature 321 applies ground to the lowerterminal of the winding of relay 323,

while the ground on the bank terminals successively engaged by wiper 311is applied through armatures 324 and 325 to the upper terminal of thewinding of relay 323. The latter said ground is also applied through theinterrupter armature of motor magnet 327 to the winding thereof,; thesaid motor magnet operating to'successively step advance the wipers 311to 313. When wiper 311 encounters bank terminal 315 it willnot receiveground because of the attracted condition of armature 306, so that theshort-circuit is removed from the winding of relay 323 and the directground is removed "from the winding of the motor magnet 327. Due to themarginal adjustment of the motor magnet, it

from the line leading to telephone A, are now will cease operating underthe condition, but

the relay 323 will operatively energize under the condition. When relay323 actuates, ground through armature 321 will be applied throughattracted armature 324, wiper 311, bank terminal 315, armature 306,upper winding of relay 302, the latter said relay fully operating. Thisdisconnects the lower winding of the latter said relay 302 at armature301 and connects ground received from the connector D over conductorthrough armature 301, bank terminal 315, wiper 311 to armature 324 tomaintain the relay 323 locked before the armature 321 has had time toretract. The relays 303 and 305 will now doactuate if there is no otherrelay like relay 302 with its lower winding energized, due to a waitingcall. It the relays 303 to 305 are actuated after relay 302 "fullyactuates, the ground applied over conductor 317 will he continuedthrough armatures 3'13 and 330 to the armature corresponding to 318 ofthe ext finder switch (not shown) like F of the group of which switch Fis one.

The ground received over conductor 7 5 is applied through arn'iaturcs331 334 to the Winding of relay 335, the latte said relay actuating.Resultant to the actuation of the relay 335 a circuit path can be tracedfrom grounded battery, upper winding of relay 401, armature 402,conductor 403, armature 336, Wiper 339 of set to 340, bani: ter1nial 343of set 341 to 344, conductor 345, armatures 501 and 502 in multiple,conductor 503, bank terminal 344, wiper 340, armature 346, conductor347, armature 405, lower winding 01": relay 401 to ground, the lattersaid relay actuating, followed by slow-releasing release relay 407.Ground will now be applied through armature 408 to release trunkconductor 409.

Ground is applied through armature 343, wiper 338, bank terminal 342,conductor 349 to the winding of relay 505, the latter relay actuating.Ground will now be appliec from armature 506, wiper 509 of set 507 to509, bank terminal 510, bank terminal 511, wiper 513 of set 512 to 515,bank terminal 516, armature 517 to the winding of relay 518, the lattersaid relay actuating and locking through armatures 519 and 420 to gro Inthis connection will be noted that the interrupter 1 revolves at he rateo'l' approximately twelve times per second, so that the next groundimpulse applied thereby will be applied through armature 521, armature522 to the winding of relay 523, and through armature 524 to the windingof motor magnet 525 oi switch It, the said relay 523 and magnet 525coincidently operating. The wipers 512 to 515 will thus be step advancedresponsive to the groundings of the interrupter 1 lit will be noted thatwhile the armature 501 will attract coincident with the firstenergization of the motor magnet 525, the armature 502 on relay 526 willmaintain the relay 401 in selector G energised until the wiper 514encounters ground on the first oil-normal bank terminal co-operativethere with and thereby energizes relay 526 over an obvious path, afterwhich time the relay 401 in selector G will be under the sole control ofarmature 501.

It will appear presently that the call in the p"esent instance is to beforwarded to telephone 1. -1, the number 0t which is 13431, andii.

accor ly, jumpers 601 to 605 in Fig. 6 are run between the crossconnecting termmals i"; to predetermine that the sending mechanism inFig. 5 will send a corresponding train of series oi directive digitimpulses. It will" 615 to bank terminal 528 of switch R, the I.

latter said terminal corresponding to a single open impulse for thedigit 1. 1n the same manner, bank terminal 529 of switch S is connectedover conductor 530, wiper 617 of set 617 to 619 of switch I, bani:terminal 620 ofset 620 to 622, jumper 602, conductor 623 to hankterminal 531 of switch R. Bank terminal 532 oi switch S is connectedover conductor 53, wiper 624 of set 624 to 626 of switch J, bankterminal 627 of set 627 to 629,"

603, conductor 630 to bank terminal s vitch R. Bank terminal 535 ofswitch S is connected over conductor 536, wiper of set 701 to 703 ofswitch K, bank rinal 7 04 of set 704 to 706, conductor 707 j K conductor623 to bank terminal 531 of switch Bank terminal 537 of switch S isconnected over conductor 538, wiper 708 of set 703 to 710 of switch L,bank terminal 711 of set 711 to 713, conductor 714, jumper 605,conductor 615 to bank terminal 528 of switch It.

Returning to the operation of the mechanism in 5, for each step that thewipers oft switch it are advanced the relay 523 will attract itsarmature 501. l lowever, until the wipers of switch it have been movedone step oil-normal so that wiper 514 rests on bank terminal 539, whenthe relay 526 will be energized and maintained so until the wipersreturn to normal, the armature 501 is disabled from ei'liecting openimpulses.

in view of the fact that ground on armature 506 is applied through wiper509, bank terminal 510, conductor 527, jumper 601, conductor 615 to bankterminal. 528, when the wiper 512 encounters the latter said terminalthe armature 501 will have sent one open impulse eilective to the relay401 in selector G. At the time wiper 512 receives ground from bankterminal 523, this ground is applied through wiper 513 and the bankterminal it is resting upon, conductor 540 to the winding ofslow-releasing relay 541, the latter said relay actuating and locking byits armature 542, wiper 514 and the bank terminal it is resting upon toground. The relay 541 will thus be maintained locked until the wipers ofswitch R are returned to normal position, the relay 541 then deactuatingconsistent with its slow-releasing characteristic to c'ause'a delaybetween the series of the train to allow for trunk hunting by theselector last operated.

Coincident with the actuation of the relay 5 11, the said locking groundreceived through wiper 51 1 is also applied through armature 545,interrupter armature to the winding of motor magnet 525, the latter saidmagnet operating to restore the wipers 512 to 515 of switch R to thenormal. position as one step so that wiper 509 will then rest on bankterminal-1,529.

.now be on bank terminal 531.

Ground applied through wiper 509 will Therefore,

' when the wiper 512 encounters the latter said bank terminal in its newstep movement responsive to the deactuation of relay 5&1, three openimpulses will have been sent from arma- 1 ture 501.

The first impulse (series) sent from the armature 501 causes theselector Gr to operate its wipers into alignment with the first levelofbank terminals and in the well known manner selectthe first idle trunktherein leading tosecon-d selector D The second series of three impulsessent by the armature 501 will be effective to operate the secondselector D in the well known manner to select third se lector F It isthought that in view of the foregoing explanations it will be clear howthe wipers of'switch R will be restored to normal following the sendingof each digit series and that the wipers of switch S will thereupon beat vanced one step when the relay 5&1 deactuates to start the nextfollowing series. So that in View of the jumpering (jumpers 601 to. theconnection will be progressed to 605) telephone A, the number of whichis 13131, responsive to the relay 335 of switch F actuating.

At the time relay 54:1 deactuates following i the last (fifth) digitseries sent while wiper 507 still rests on bank terminal 553, and thesaid wiper 507 then moves to bank terminal 554,'ground received fromarmature 520 will be applied through bank terminal 554, wiper 507,conductor 556, bank terminal 341, wiper 337, armature 350,make-before-break spring 351 to the winding of relay 352, the lattersaid relay actuating, followed by the deactuation of relay 335.

At this time the windings of the line relay in the connector H Wlll beenergized over a series path including the conductors:

r armatures 357 353 and winning oi: i 22,

relay in connector H will be; reversed in direction so that the armatureof relay 360 will tilt counter-clockwise into the indicated ans. pos.When the armature of relay 360' tilts clockwise, slow-releasing relay362actuates from the ground on the latter said armature. Then, when thelatter, said armature tilts counter-clockwise, the rlay 363 actuates andrelay 362 deenergizes. There will, therefore, be a time'when both relays362 and 363 are actuated due to the slow-releasing charactcristic ofrelay 362, and during this time a. short-circuit through armature 364and make-betore-break spring 365 is across the talking path includingconductors 7 67 7 bank terminals 366367, wipers 312313,' armatures368369 and armature 370. This will cause the ring-cut-otf relay inconnector D to actuate in the well known manner to complete talkingconnection over the traced path including condensers 37 5376 between thecalling telephone A and the finally called telephone A to which the callto the line leading to telephone A was forwarded. When the'relay 362deactuates the retardation coil 380 becomes in series with the windingsof the baclcbridge relay in con-- nector D and this holds the lattersaid relay actuated.

It will be understood that any well known or other suitable so-termedtrunk repeater may be introduced into the trunk leading-in to selector Dfrom the banks of selector G. This will also apply to the trunkleading-in to selector D from the banks of selector E. The effectiveoperation will be the same as if the said repeaters were not employed,being used for translating from three wires to two wires for theinter-oliice trunk.

Gall ring party at telephone A abandonscall while caZZ is beingforwarded If it is assumed that the calling party at telephone A.abandons the call while the call is being forwarded from the primarilycalled line to telephone A, it will be clear that connector D andantecedent switches will restore to normal positions, subject to newuse. This will remove the ground from conductor 75, so that relays 323and 335 of the switch F will deactuate to render said F subject to newuse. Relay 505 will deenergize responsive to the deactuation of relay335, so that relay 518 will unlock. The armature 560 of relay 518 willnow apply ground through 't'v'iper 508 to cause motor magnet 550 torestore wipers 507 to 509 to normal position as drawn. The armature 561of relay 518 will now apply ground through wiper 515 to cause motormagnet 525 to restore the wipers 512 to 515 to no ma l position asdrawn.

Dispensing with relay 362 0r retardation coz' It will be noted, in thisconnection, that by making the resistance of retardation coil 380 oflower ohmic value so that the ring-cutoii? relay and back-bridge relayin connector D will pick-up through its winding, relay 362 may bedispensed with and. the connection shown including make-before-breakspring 365 made permanent. Moreover, re-

ardat-ion coil 380 may be dispensed with, but retaining relay 362 underthis condition. However, dispensing with coil 380 will cause theback-bridge relay in connector D to deactuate consistent with thedeactuation of relay 362, which would cause the current projectedtowards calling telephone A. to

be restored to its original direction forthwith after it momentarilychanged resultant to the response at telephone A. Under certainoperating conditions, this might not be desirable, and in the latterevent coil 380 could not be dispensed with.

Encoantering the line leading to telephone A busy Releasingeonneetom-Oalled party hangs up first If it is assumed that the calledparty at telephone A hangs up first upon the termination of theconversation, this will reverse the direction oI current in the windingof polarized relay 360, causing relay to de ctuate and open the pathincluding the windings of the back-bridge relay in connector D,notwithstanding relay actuates and armature 364 is, heretore, attracted.The connector D will not release its wipers under the present condition.Also, connect-- or H will not release its wipers under the presentcondition because the line relay ot the latter said connector is stillmaintained energized through the windings of relay 360.

When the calling party at telephone A new hangs up his receiver, and inView olt-the fact that the baclobridge relay in connector D isdeactuated, connector D will release its wipers, and the connection fromtelephone A" up to and including connector D will be leased to normal,subject to new use. round being thus remove in con ductor 75, relay 352will deactuate and open the path including the winding of the relay 860,so that the front bridge relay in connector H will deactuate and causethe latter said connector to release its wipers, and the antecedentselectors F D D and G to release their wipers, the circuits used in the"call being now at normal.

Releasing e0nneeti0n-O'aZZing party hangs up first If it is assumed thatthe calling party at telephone A hangs up first upon the termination ofthe conversation, this will cause the line relay of connector D todeactuate, followed by the release 01" the antecedent switches D C B andL connector D re maining in seizure. When the called party at telephoneA hangs up, the current traversing the winding of relay 360 will bereversed, causing relay 363 to deactuate to open the path includingretardation coil 880 so that the back-bridge relay in connector D willdeac'tuate to release the wipers of the latter said connector. W'henconnector D releases, ground is removed from the conductor 7 5, so thatrelays 323 and 352 will deactuate to open the circuit path including thewinding of relay 360 and cause the line relay of connector H todeactuate. Since the backbridge relay of this connector H deactuatedresponsive to the party at telephone A hanging up, the wipers ofconnector H will release, the circuits used in the call being nownormal.

Party at telephone A may change the normal prearranged setting forforwarding call to telephone A to a random desired line In the foregoingdescriptions the wipers of switches H, I, J, K and L were assumed in thenormal drawn position. The bank terminal 510 of switch S is connected tothe wiper 608 of switch H. The tour successive bank terminals 529, 532,535 and 537 following bank terminal 510 are connected to wipers 617,624, 701 and 708 of switches I, J, K, and L, respectively.

Before the partyat telephone A hung up his receiver after causing setrelay C to be actuated and locked, at which time he perhe noted thatunder thecondition.

ofcausing relay Cto be set as assumed, the

relay 24 will be in its actuated condition while the party at telephoneA maintains his receiver oil the switch-hook, so that a iUlICllii) canbe traced from line terminal 81,

conductor 82, attracted armature 83, con duc'tor 8%, upper winding ofrelay 715 to grounded battery. Also, a circuit can be tracedfromterminal85, conductor 86, attractedarmature 87, conductor 88, lowerwinding of relay 715 to ground, the latter said relay actuating. Theslow-releasing relay 716 actuates, energized in a local circuit of relay715. Relay 717 then actuates,

energizedin a local circuit of relay 716.

When the party at telephone A hangs up his receiver after setting relayC, forthwith, without annexing any digits, the relay 715 will'deactuate, its armature 718 applying round throu h armature 719 windinof g t a: 9 g

slowereleasing relay 720, wiper 722 of set 721 and 722, bank terminal'723, conductor 72& to the winding of motor magnet 632, the latter saidmagnet stepping the wipers of switch H one step from the drawn position.

will occur to the setting effected by relay 6. It will also be notedthat when relay 720 aotuates, its armature 730 applies ground to thewinding of motor magnet 732 of switch M, so that when relay 7 20deactuates fol-lowing the impulse sent to the motor magnet 625, thearmature of the motor magnet 732 will advance the wipers 721 and 722 onestep. When the relay 717 deactuates, ground will be applied througharmature 735, bank terminals (to-operative with wiper 721, interrupterarmature on the motor magnet 732 to the winding of lattter said motormagnet, causing it to operate and step the wipers 721 and 722 of switchM around to the drawn position.

However, in the present instance, the party at tele hone A does not hangup his re ceiver EOItllWltll after setting relay 0, but, on the otherhand, annexes the five digits 1 1 32-1 designating the random lineleading to telephone A for example. The

sending of first digit 1, constituted of one open impulse, will causerelay 715 to momentarily retract armature 718, so that a ground impulseWill be sent from said arma- Thus,

ture 718, armature 719, Winding of relay 720, wiper 722, bank terminal723, conductor 72% to the winding of motor magnet 632, the

wipers of switch H being thereby stepped one step so Wiper 608 will nowrest on bank terminal 635 when the armature of said motor magnet 632retracts. The armature 730, when retract ng, will cause the operation ofmotor magnet 732 to advance the wipers 0t switch M one step, so thatwiper 721 will now rest on bank terminal 7 37;

The sending of second digit 4?, consti tuted of four open impulses, willcause relay 715' to momentarily retract its armature 718 four times, sothat four ground impulses will be sent from thearmature 718, armature719, winding of relay 720, wiper 722, bank terminal 738, conductor 739to the winding of motor magnet 642, the wipers of switch I being therebysteppedv four steps so'that wiper 617 will now rest on bank terminal 710, conductor 741 to the winding of motor magnet 652, the wipers ofswitch J being.

thereby stepped three steps, so that wiper 62 i will now rest onbankterminal 653. The retraction of armature .730 will cause theoperation of motor magnet 732 to advance the wipers of switch M onestep, so wiper 7 22 will now rest on bank terminal 742.

The sending of fourth digit 2, constituted of two open impulses, willcause relay 715 to momentarily retract its armature 718 two times, sothat two ground impulses will be sent from armature 718, armature 719,winding of relay 7 20, wiper 7 22, bank terminal 74-2, conductor 743 to'the winding of motor magnet 7 15, the wipers of switch K being therebystepped two steps so that wiper 701 will now rest on bank terminal 746.The retraction of armature 730 will cause the operation of motor magnet732 to advance the wipers of switch M one step, so wiper 7 22 will nowrest on bank terminal 748. r

The sending of the fifth digit 1, constituted oi one open impulse, willcause relay 71.5 to momentarily retract its armature 718 one time, sothat one ground impulse will be sent from armature'718, armature 719,winding of relay 720, wiper 722, bank terminal 748, conductor 749 to thewinding of motor magnet 750, the wipers of switch L being therebystepped one step so wiper 708 will now rest on bank terminal 7 51. Theretraction of armature 7 30 will cause the operation of motor magnet 732 to advance the wipers of switch M one step, so wiper 722 will nowrest on bank terminal 752.

It will be noted that under the last toregoing condition, the bankterminals 510, 529, 532, 535, and 537, co-operative with wiper 509, arenow connected through wipers 608, 617, 62-l, 701, and 708 over theobvious circuit paths to terminals 528, 534, 531, 558, and 528,respectively. Under this condition, it will be clear that the sendingmechanism will be set to send the train or digits 1at321 responsive tothe terminals 71 to 73 being seized by the wipers of connector D.

In this connection, it will be understood that although the jumpers 601to 605 set the sending mechanism to send the digits 1-3 1-31corresponding to the telephone number of telephone A, when the wipers60?, 617, 62 1, 701, and 708 are in their normal positions as drawn,this same set-up may be attained by directively setting the latter saidwipers on the bank positions corresponding to digits 1-3431,respectively. That is to say, it is not necessary to have the jumpers601 to 605, but to do away with them will make it necessary to alwaysdirectively set, not only relay C, but also the switches H to L inaccordance with a telephone number.

Tone indicates when switch L 2'8 set When the par y at telephone A hasset the switch L responsive to the last digit of the desired number14321, for example, tone from source T will be applied through a portionof the winding of the motor magnet 750, wiper 710, a co-operating bankto 'minal, condenser 755, conductor 88, audible to the party attelephone A. This will indicate that the last switch L operated.

Upon the party at telephone A hanging up his receiver, relays 24:, 715,716, and 717 will deactuate; also, the relay 212, the windings of whichhave been in multiple with the wind ings of relay 715. The wiper 709being off the bank terminal. it is drawn resting upon, and is restingupon baulr erminal 7 56, when relay 717 deactuates there will be noground applied through the armatures of this relay from wiper 709, sothe wipers of the switches H to L will not be restored at this time.however, retracted armature 735 causes the wipers of switch M to restoreto the drawn position by interrupter action of its motor magnet 732.

If only part of switches H to L are set time switches ml to L, had faied to se all latter said switches, by leaving off one or more of thefive digits, the wiper 709 would then be in the drawn position, restingon bank terminal 712. So when relay 717 deactuates responsive to thehanging up of the receiver oi? telephone A, the ground on wiper 709 willbe applied through bank terminal 712, conductor 726, and in multiplethrough those of wipers 609, 618, 625 and 702 as are in oil"- .normalposition, respective bank terminals co-operatcd with the latter saidwipers, conductor 634, and through the multipled arma res of said relay717 to the bank contacts cooperated with wipers 61.0, 619, 626 and 7 03to the respective motor magnets of the switches H to K, the wipers ctwhich are oilnormal, to restore the wii ers of these switches to thedrawn normal positions, the switch M restoring to the drawn normalposition responsive to the retraction of armature 735, in the mannerbefore described.

Under the latter said restored condition of the switches H to M anycalls directed to the line leadin to telephone A. will be forwarded totelephone A in accordance with the jumpers 601 605 and the settings ofthe switches whe in the drawn positions, since only relay s will not beset.

Unsczitng the relay 0 and the switches H to L llhen the party attelephone A desires to i t his line for forwarding calls directed reto,he will remove his receiver as it to nitiato a call, and thereuponoperate his callng device dial in accordance with the fingeriold used insending; a series of eleven open impulses. This will cause the relay 31to operate in the manner betore described to unlatch the catch 38 torelease the springs of the relay Ground will not be applied throughspring 90, conductor 91, multipled armatures on relay 717, bankterminals (:0- operative with wipers 610, 619, 620, 7 08 and 710,through the interrupter contacts of the motor magnets of switches H toL, respectively, to restore said switches to the drawn posi tions. Thelatter said restorations eitace the specifically set up conditionetlectcd by the switches H to L. The line leading; to telephone A will.therefore become in its normal, unused condition when the party attelephone A. hangs up his receiver and causes selector E to restore andrelay 81 to unlock.

The switches H to L are drawn with live sets of bank terminals. In acommercial embodimcnt there would be eleven such sets; a normal positionset, and a position set for each digit from 1 to 0, so that numbershaving digits 0;? random value may be set by the switches H to L, andnot limited to the digit 4 in each case, as in the exemplary embodimentin the accompanying drawings.

he tive switches H to L contemplate a train of live digit series. Itwill be clear that more switches may be added to increase this ly. Thlsmodlfication also discloses the range,,the switch M having correspondingbank positions added.

Preferred modification By in roducing Fig. 8 into Fig. 1 according tothe index designations, it will be clear that 'when the party attelephone A removes his receiver to initiate a call, he will perceivetone from source T or TT, depending upon Whether the relay C 1s or isnot set, respectivespring 801 and co-operating springs to disable thetone source T and T from being applied in the manner before set forthunless relay C operated as intended responsive to the actuation] ofrelay 24 or relay 31. However,

. it is to be understood that the details of said Fig. 8 is not merelyan alternative structure or modification, but on the contrary, is to beunderstood as belonging to the structure to which it refers; that is aselement of the main embodiment first described to which it relates. Thedisclosure in 8 has been so illustrated separately solely to simplifythe disclosure as a whole to which it is to be consideredacomponentpart.

1. In an automatic telephone system, a

first line, a second line, first automatic switch means for extendingconnection to said first line, second automatic switch means forextending connection from said. first line to said second line, andmechanism operated automatically in accordance with the time of day fordetermining whether or not responsive to effecting a connection to saidfirst line will thereupon cause'said second switch means to progress theconnection to said second line.

2. I11 an automatic telephone system, a first line, a second. line,first automatic switch means for extending connection to said firstline, second automatic switch means for extending connection from saidfirst line to said second line mechanism operated automatically inaccordance with the time of day for determining whether or notresponsive to effecting a connection to said first for determiningwhether or not responsive i to effecting a connection to said terminalsby sald selective switch will thereupon cause sa d switch-mechanism toprogress con nection from said terminals to said called line,

4. In an automatic telephone system, a calling line, a called line, aplurality of other lines, first automatic switch mechanism for calledline, and automatic means for predetermining prior to eiiectingconnection to said called line to which particular one of said randomother lines the connection will be extended to. p

5. In an automatic telephone system, a calling line, a called line, aplurality of other lines, first automatic switch mechanism for extendinga connection from the calling line to the calledlme, second automaticswltch mechanism for progresslvely linking con nection from said calledline to a random one of said other lines, means for causing operatlon ofsaid second automatic swltch mechanism to further link connection fromsaid called line to a random one of said other lines responsiveto'extending connection to said called line, and automatic means forpredetermining prior to efiectingconnection to said called line to whichparticular one of said random other lines the connection will be linkedto. v

6. In an automatic telephone system, a calling line, a called line, aplurality of other lines, first automatic switch mechanism for extendinga connection from the calling line to the called line, second automaticswitch mechanism for extending connection from said called line to arandom one of said other lines, means for causing operation or saidsecond automatic switch mechanism to further extend-connection from saidcalled line to a random one of said other lines responsive to extendingconnection to said called line, and automatic means controlled over thesaid called line for predetermining prior to effecting connection tosaid called line to which particular one of said random other lines theconnection will be extended to.

7. In an automatic telephone system, a calling line, a calledline, aplurality of other lines, first automatic switch mechanism for extendinga connection fromthe calling line to the called line, second automaticswitch mechanism for extending connection from said called line to arandom one of said other lines, a set mechanism individual to the saidcalled line, means including said set mechanism "for causing operationof said second automatic switch mechanism to further entend connectionfrom said called line to a random one of said other lines responsive toextending connection to said called line, means controlled over thecalled line for variably setting said set mechanism prior to effectingconnection to said called line, and means predetermined by said settingof said set mechanism tor determining to which said other line theconnection will forv-iarded to responsive to ellecting connection tosaid called line.

8. in automatic telephone system, a calling line, a called line, aplurality of other lines, first automatic switch mechanism for extendinga connection from the calling line to the called line, second automaticswitch mechanism for extending connection from said called line to arandom one of said other lines, a set mechanism individual to thesaidcalled line, means including said set mechanism for causingoperation of said second automatic switch mechanism to further extendconnection from said called line to a random one of said other linesresponsive to extending connection to said called line, means forsetting said set mechanism prior to eilecting con nection to said calledline, means predetermined by said setting of said set mechanism fordetermining to which said other line the connection \Vlll be forwardedto responsive to effecting connection to said called line, and means formakii'ig an additional setting 01' the setting mechanism prior toeffecting connection to said called line without etl'acing the firstmentioned setting for predetcrmining that the call will be r'orwarded toanother oi said other lines in lieu of the line predetermined by firstsaid Setting.

In an automatic telephone system, a calling line, called lines, switchmechanism for extendin connection from the calling line to a random oneof the called lines, a register, an impulse sending device, meanscontrolled over the calling line for registering the resignation of arandom one of said called lines in said register to prepare the impulsesending device to thereafter send impulses to direct the operation ofthe switch mechanism to complete a connection from the calling line tothe random called line, a selective switch having access to the callingline, and means operated responsive to said selective switch selectingthe calling line to cause the impulse sending device to direct theoperation of the switch mechanism to extend a connection from thecalling line to said random called line.

10. In an automatic telephone system, a calling line, called lines,switch mechanism for extending connection from the calling line to arandom one off the called lines, a register, an impulse sending device,means controlled over the calling line for registering the designationof a random one of said called lines in said register to prepare theimpulse sending device to thereafter send impulses to direct theoperation of the switch mechanism to complete a connection from thecalling line to the random called line, and means directively operatedover the calling line after the designation has been registered forcausing the impulse sending device to operate in accordance with theregistration in the reg ister to extend the connection from t 1e callingline to said random called line.

11. in an automatic telephone system, a calling line, called lines,switch mechanism for extending connection from the calling line to arandom one of said called lines, a register, an impulse sending device,means controlled over the calling line for registering the designationof a random one of said called lines in said register to prepare theimpulse sending device to thereafter send impulses to direct theoperation of said switch mechanism to complete a connection from thecalling line to said random called line, means directively operated overthe calling line after the designation has been registered for causingthe impulse sending device to operate in accordance with theregistration in the register to cause said switch mechanism to extendthe connection from the calling line to said random called line, meansfor etlacing the connection to said random called line, and directivelyoperated automatic means for causing the impulse sending mechanism tooperate to cause said switch mechanism to again extend the connectionfrom the calling line to said random called line without againregistering the designation of said random called line in said register.

12. In an automatic telephone system, a

calling line, called lines, a first impulse send ing device on saidcalling line, a register, a second impulse sending device, means foroperating the register responsive to said first impulse sending deviceto record the designation of a desired one of the called lines, meansfor operating said second impulse sending device under control of saidregister due to the specific recorded condition in the register, switchmechanism for extending connection from the calling line to the saidrandom called line, means for directively operating said switchmechanism by said second impulse sending device under control of saidregister to effect connection from the calling line to said randomcalled line, and means for applying an indication to the calling lineresponsive to said register having operated to complete the recording ofsaid designation.

13. In an automatic telephone system, a first line, relay, a register,said relay set over said line responsive to a predetermined operation,said register set over said line responsive to a predetermined operationfollowing first said operation, a plurality of called lines, switchmechanism for extending connection from said first line to a designatedone of said called lines, switch means for ex-

